weird problem with add effect

hey guys, maybe it’s my old graphics card, I’m not sure, but I had a problem, where I was using some flare textures mapped onto a tga using the add effect, and as they got closer to the camera, some of them faded out and disappeared. anyone know what is up with that? I tried adjusting the clipstart on the camera to zero, but that had no effect.
(edit) well, I took the lamp out of my scene, and everything works fine now. for some reason, the faces seemed to be recieving light, even though they were all set not to.

that happens to me when i have ‘use blender materials’ chacked… no idea why